My grandma was a hoarder and I decided I'd never be that way, so I've been trying to get where I could move everything I own in a car (not a truck or SUV even, but basically any vehicle that isn't basically a 2 seat sports car). This way moving is easier and cheaper. I hang onto clothes (when I like it, if its something I don't like to wear then get rid of it because no point to keeping it, but I have shirts from high school that I still wear - which some I had put away in a box so they weren't all threadbare or anything, although some have started to get holes and then they become just around the house shirts until they get bad enough then yeah trash it), but I also kinda transition in weight a fair amount too regularly so I'd need to be buying new clothes far too often for my liking, and better to just hang onto them and then put in storage when it doesn't fit (and weed out ones you don't like when you go to store them).
For bedding, I just assume I'll buy new bedding if the move is far enough (I also am weird in that I can sleep fairly comfortably on the floor, especially if I get a roll of memory foam to put under say a sleeping bag; not ideal certainly but I could manage, and I can genuinely sleep comfortably on a futon; unless I get stupid rich somehow, I don't see ever buying like a big king sized 4 poster bed or anything). And for appliances I'd sort that out too (haven't stabilized enough to be buying where I'd think about getting my own appliances, I'd probably go with a mini-fridge and use a laundromat or pay a friend to use theirs until I get my own). Other furniture I'd buy to suit my needs at the time (probably check used on Craigslist/Facebook Marketplace/etc).
I actually need to get rid of some things. I just recently switched to using a 4K TV as a monitor (my Mom got it at work for $150 on clearance as they were putting up the new 2018 models), so I have 3 older LCD monitors that I don't have a use for. I'll probably keep one just to have it around if I need a monitor (one is a Dell 22" 1080p touchscreen, so it'd be handy in a pinch), but especially the like 10 year old 1680x1050 monitors I don't need any more (they were nice at the time, one is an NEC 20WMGX2 and the other a Dell 2007WFP). The bonus is that it puts out less heat, and uses less electricity. I'll probably move back to a real PC display in the future (I wish someone would make a standalone display like the Surface Studio, with a big ~4K pen input display). And then pair it with an OLED when they become reasonably priced for a second "watching/gaming" display, or maybe a 4K projector (gave my 1080p LCD Epson to my sister).
I have been wanting to get a decent sit-stand desk though, and have been considering the Husky "workbench" that goes on sale for $150-200 at Home Depot sometimes. Its more robust than most sit stand desks (and could always use it for something else if I get a nicer motorized desk or something) so it should hold up well with time but would be more of a pain to move since its around 100lbs (so even taken apart it'll be fairly hefty).
I'll be happy when they get USB-C (or maybe even after that) sorted out and it can replace HDMI/DP, normal USB, and device charging cables so I can just have like 5 cables instead of like 5 for each. I think I still have some VGA cables and old SATA 1 and other crap in my "old/random cables" box.